wanopt: caching static content without file extensions

[Agent_1994]

Hello!

 I've a customer that wants to cache static web content from a intranet site, let's call it "SERVER".

 On SERVER, there are a lot of image files that doesn't have a file extension. Ie:

http://SERVER/blah/images/ABC/DEF

http://SERVER/blah/images/GHI/JKL

...

 There is a clear pattern in the path, and the content type given by IIS is "image/jpeg", however they are not being cached (bypassed).

 Is there a way to deal with this without renaming the files (long story)? Something like force caching by content type, or path.

 Greets,